package com.huaxinkai.mobile.util.wechatUtil;

import java.io.InputStream;
import java.io.Writer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import com.huaxinkai.mobile.util.wechatUtil.bean.Article;
import com.huaxinkai.mobile.util.wechatUtil.bean.MsgMediaId;
import com.huaxinkai.mobile.util.wechatUtil.bean.WeChatResNewsMessage;
import com.huaxinkai.mobile.util.wechatUtil.bean.WeChatResTextMessage;
import com.huaxinkai.mobile.util.wechatUtil.bean.WechatResImageMesage;
import com.huaxinkai.mobile.util.wechatUtil.bean.WechatResVoiceMesage;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.core.util.QuickWriter;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;
import com.thoughtworks.xstream.io.xml.XppDriver;

/**
 * 解析微信发来的请求（XML） 工具类
 * 
 * @author 刘忠华
 * 
 */
public class WeChatParserXmlUtils {
	/**
	 * 解析微信发来的请求（XML）
	 * 
	 * @param request
	 * @return
	 * @throws Exception
	 */
	@SuppressWarnings("unchecked")
	public static Map<String, String> parseXml(HttpServletRequest request) throws Exception {
		// 将解析结果存储在HashMap中
		Map<String, String> map = new HashMap<String, String>();

		// 从request中取得输入流
		InputStream inputStream = request.getInputStream();
		// 读取输入流
		SAXReader reader = new SAXReader();
		// 通过IO 获取Document
		Document document = reader.read(inputStream);
		// 得到xml根元素 节点
		Element root = document.getRootElement();
		// 得到根元素的所有子节点
		List<Element> elementList = root.elements();

		// 遍历所有子节点
		for (Element e : elementList)
			map.put(e.getName(), e.getText());

		// 释放资源
		inputStream.close();
		inputStream = null;

		return map;
	}

	/**
	 * 文本消息对象转换成xml
	 * 
	 * @param textMessage
	 *            文本消息对象
	 * @return xml
	 */
	public static String textMessageToXml(WeChatResTextMessage textMessage) {
		xstream.alias("xml", textMessage.getClass());
		return xstream.toXML(textMessage);
	}
	/**
	 * image消息转化xml
	 * @date 2017-1-1 13:24:47
	 */
	public static String imageMessageToXml(WechatResImageMesage img) {
		xstream.alias("xml", img.getClass());
		xstream.alias("Image", new MsgMediaId().getClass());
		return xstream.toXML(img);
	}
	/**
	 * voice消息转化xml
	 * @date 2017-1-1 13:24:47
	 */
	public static String voiceMessageToXml(WechatResVoiceMesage voice) {
		xstream.alias("xml", voice.getClass());
		xstream.alias("Voice", new MsgMediaId().getClass());
		return xstream.toXML(voice);
	}

	/*	*//**
	 * 音乐消息对象转换成xml
	 * 
	 * @param musicMessage
	 *            音乐消息对象
	 * @return xml
	 */
	/*
	 * public static String musicMessageToXml(MusicMessage musicMessage) {
	 * xstream.alias("xml", musicMessage.getClass()); return
	 * xstream.toXML(musicMessage); }
	 */

	/**
	 * 图文消息对象转换成xml
	 * 
	 * @param newsMessage
	 *            图文消息对象
	 * @return xml
	 */
	public static String newsMessageToXml(WeChatResNewsMessage newsMessage) {
		xstream.alias("xml", newsMessage.getClass());
		xstream.alias("item", new Article().getClass());
		return xstream.toXML(newsMessage);
	}

	/**
	 * 扩展xstream，使其支持CDATA块
	 * 
	 * @date 2013-05-19
	 */
	private static XStream xstream = new XStream(new XppDriver() {
		public HierarchicalStreamWriter createWriter(Writer out) {
			return new PrettyPrintWriter(out) {
				// 对所有xml节点的转换都增加CDATA标记
				boolean cdata = true;

				@SuppressWarnings("rawtypes")
				public void startNode(String name, Class clazz) {
					super.startNode(name, clazz);
				}

				protected void writeText(QuickWriter writer, String text) {
					if (cdata) {
						writer.write("<![CDATA[");
						writer.write(text);
						writer.write("]]>");
					} else {
						writer.write(text);
					}
				}
			};
		}
	});



}
